The best Calendar alternative to Google Workspace is CryptPad, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Google Workspace and 12 are Calendar Apps so hopefully you can find a suitable replacement. Other interesting Calendar App alternatives to Google Workspace are Nextcloud Hub, Kolab, Zimbra Collaboration Suite and Nino.
CryptPad is a private-by-design alternative to popular office tools and cloud services. All the content stored on CryptPad is encrypted before being sent, which means nobody can access your data unless you give them the keys.
Nextcloud is the most deployed on-premises file share and collaboration platform. Access & collaborate across your devices. As fully on-premises solution, Nextcloud Hub provides the benefits of online collaboration without the compliance and security risks.
Almost everyone thinks Nextcloud Hub is a great Google Workspace alternative.
Kolab provides a FOSS communication & collaboration solution that can be completely self-hosted. Take back control of your data and access it via the webinterface, or existing mobile & desktop clients.
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors.
Nino is the modular workspace for professionals. It is a collection of software that can interoperate with each other on the block-level from one uniform interface.
Wimi is the ultimate productivity tool. It integrates all the essential applications to facilitate teamwork. Wimi saves time to managers and entrepreneurs working with teams and clients.
Kolab Now provides a suite of intuitive apps in a user friendly environment to make your day to day online comms easier, smarter and most importantly; secure.
Zillum is an integrated bundle of seven applications to help families communicate, share and collaborate between themselves. This includes emailing, messaging, file storage, password management, word processor, spreadsheet, and presentation tools for content creation.
Hub For Teams gives you and your team 100% control of your data and workspace. Enjoy enterprise collaboration features such as project management, discussion rooms, and much more.
Virtual Office, Online Office, Digital Learning Space, Online Groupware - ContactOffice, Keep a virtual office on the web. Share documents, contacts, calendar, tasks, ... with clients, students, suppliers, friends or family.
Mailture, a secure, business-oriented email service, is made to cater to all your emailing needs. With top-notch collaboration and communication features, Mailture offers much more than your usual inbox.
Pivot is a workspace platform for communities, courses, projects, and teams. It combines real-time and async communication tools.
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It protects your privacy. Keep your data yours! Also, it doesn't just drop products at random times...